Which federated repositories configuration will address the customer requirements?

The customer currently maintains all its users in Active Directory. As part of its new IBM Security Access Manager (ISAM) V9.0 deployment, the customer understands it will have to implement the ISAM “Global Sign-on (GSO)” to archive SSO with certain backend applications which do their own authentication and cannot be modified.

Which federated repositories configuration will address the customer requirements?
A . Use an external ISDS LDAP as the ISAM primary LDAP, federate with the AD and import all AD users into the ISAM TD
C . Configure the AD as the ISAM Primary LDAP, which will create the necessary secauthority= default suffix. Import all users into the ISAM A
E . Use the ISAM embedded LDAP as the Primary LDAP, federate with the AD and configure “basic user”, and specify “basic-user-principal-attribute= samAccountName”
F . Use an external ISDS LDAP as the Primary LDAP, federate with the AD, configure “basic user”, specify “basic-user-principal-attribute= samAccountName” and “basic-user-suffix= secauthority=default”.

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Answer: C